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bibiki

Member

Registered: 2015-09-15

Posts: 14

powertop, high energy consumption by Display backlight

could you please help to detect the problem?
https://imgur.com/pCeJ6XE.png

Mod edit -- Replaced oversized image with link

Last edited by V1del (2021-05-05 13:18:34)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,707

Re: powertop, high energy consumption by Display backlight

Please don't embed oversized images directly and especially not images of text, just paste the text in code tags.

Well the main fix to high display power usage is to reduce the display brightness, assuming that's not the end all be all here, can you post more details on your hardware? What kind of laptop, what's the model, which graphics chip, is this an Optimus system, how is it configured if so, etc.etc.

bibiki

Member

Registered: 2015-09-15

Posts: 14

Re: powertop, high energy consumption by Display backlight

legion 5 , 4800H/nvidia 2060
i dont use nvidia 2060, only integrated GPU

glxinfo|egrep "OpenGL vendor|OpenGL renderer"                         
OpenGL vendor string: AMD
OpenGL renderer string: AMD RENOIR (DRM 3.40.0, 5.11.15-arch1-2, LLVM 11.1.0)

HalosGhost

Forum Moderator

From: Twin Cities, MN

Registered: 2012-06-22

Posts: 2,092

Website

Re: powertop, high energy consumption by Display backlight

Out of interest, what's the backlight's brightness set to? And, if you lower it to the lowest setting before being off, does that change what it reads in powertop?

All the best,

-HG

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sabroad

Member

Registered: 2015-05-24

Posts: 242

Re: powertop, high energy consumption by Display backlight

From [SOLVED] Display backlight consumes too much battery power:
The "Power est." is just an estimate based on apportioning battery reported discharge rate to system activity. Calibrate powertop to improve this estimate with data points.

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saint_abroad

sabroad

Member

Registered: 2015-05-24

Posts: 242

Re: powertop, high energy consumption by Display backlight

From [SOLVED] Display backlight consumes too much battery power:
The "Power est." is just an estimate based on apportioning battery reported discharge rate to system activity. Calibrate powertop to improve this estimate with data points.

At a guess it's probably the Nvidia 2060 still active when the display is active.

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saint_abroad

bibiki

Member

Registered: 2015-09-15

Posts: 14

Re: powertop, high energy consumption by Display backlight

after calibration

The battery reports a discharge rate of 12.1 W
The energy consumed was 490 J
The estimated remaining time is 4 hours, 43 minutes

Summary: 1803.9 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS ops/sec and 30.2% CPU use

Power est.              Usage       Events/s    Category       Description
  16.0 W     25.1%                      Device         Display backlight
  8.74 W    100.0%                      Device         USB device: USB Receiver (Logitech)
  6.59 W      1.8 pkts/s                Device         Network interface: wlan0 (iwlwifi)
  3.88 W      4.9 ms/s      29.4        Process        [PID 1174] /usr/bin/pulseaudio --daemonize=no --log-target=journal
  2.04 W    100.0%                      Device         Radio device: ideapad_acpi
    0 mW     84.8 ms/s     196.4        Process        [PID 749] /usr/lib/Xorg -nolisten tcp -background